Physics: Converging and Diverging Lenses

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SUMMARY

The discussion focuses on the calculations involving converging and diverging lenses using the lens formula 1/V = 1/U - 1/F. The user initially calculated a value of 57.5 cm for the image distance (V) but encountered an incorrect result of -14.9 cm when applying the formula with a focal length of -20 cm. Participants suggest using ray diagrams as a visual aid to better understand the lens behavior and to reconsider the calculations, hinting that a value of 14.8 cm may be more accurate.

PREREQUISITES
  • Understanding of the lens formula: 1/V = 1/U - 1/F
  • Knowledge of ray diagrams for optical systems
  • Familiarity with the concepts of converging and diverging lenses
  • Basic skills in solving algebraic equations
NEXT STEPS
  • Study the principles of ray diagrams in optics
  • Practice calculations using the lens formula with various focal lengths
  • Explore the differences between converging and diverging lenses
  • Investigate common errors in lens calculations and how to avoid them
USEFUL FOR

Students studying optics, physics educators, and anyone interested in mastering the principles of lens calculations and their applications in real-world scenarios.

casiocasio442
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Thread moved from the technical forums, so no Homework Template is shown.
Summary:: I cannot seem to get the answer to the following question.
For (a) I am using the formula 1/V= 1/U- 1/F, giving me 7.5cm. I am then adding this to 50cm to get 57.5cm. I then used -1/20-1/57.5-1/v to get **-14.9cm** which is Incorrect.
Any help greatly appreciated!

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You could try drawing the ray diagrams to give you an idea of what the answer should be. That might help you think about what you need to do to actually calculate it.
 
Have you tried 14.8?
 

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